How to test method call from within another method using junit

Question

I am new to unit testing in java so please excuse if this is a silly question. I have a method like the one below. What I want to do is verify that this method is being called and also check that the parameters that are passed are not null and also being called. How can I go about doing this in junit/mockito?

public <return type> callMe(Object objectA) { if(objectA.name != null && objectA.age != null) { someOtherMethod(objectA.name, objectA.age) } }

Does calling someOtherMethod produce any effect that can be observed from outside the class under test? If yes - then you should be asserting on that publicly visible effect, rather than the fact that someOtherMethod was called, which is an implementation detail. — Egor
– Egor, Commented Jun 23, 2020 at 0:29
So do I need to make a CallMe callMe = new CallMe and then do something like callMe.someOtherMethod ? — Mohamed Ali
– Mohamed Ali, Commented Jun 23, 2020 at 0:31

Armando Almeida · Accepted Answer · 2020-06-23 01:09:20Z

I think one alternative is using @Spy annotation to execute the method inside your first method and after that check the result. https://www.baeldung.com/mockito-spy

You can also use the Mockito.veify(...) to check if the method was called. https://www.baeldung.com/mockito-verify

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